调整图像视图的大小
按键：
COMMAND + = 或者菜单选择 Editor ➤ Size to Fit Content
输入完成后关闭键盘
添加以下函数，并关联Did End On Exit事件：
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| - (IBAction)textFieldDoneEditing:(UITextField *)sender {
[sender resignFirstResponder];
}
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通过触摸背景关闭键盘
将view所指向的UIView对象所属类改成UIControl，并添加以下函数关联Touch Down事件：
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| - (IBAction)backgroundTap:(id)sender {
[self.nameField resignFirstResponder];
[self.numberField resignFirstResponder];
}
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滑动条
代码示例：
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| - (IBAction)sliderChanged:(UISlider *)sender {
int progress = lround(sender.value);
self.sliderLabel.text = [NSString stringWithFormat:@"%d", progress];
}
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开关控件
代码示例：
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| - (IBAction)switchChanged:(UISwitch *)sender {
BOOL setting = sender.isOn;
[self.leftSwitch setOn:setting animated:YES];
[self.rightSwitch setOn:setting animated:YES];
}
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分段控件
代码示例：
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| - (IBAction)toggleControls:(UISegmentedControl *)sender {
if (sender.selectedSegmentIndex == 0) {
self.leftSwitch.hidden = NO;
self.rightSwitch.hidden = NO;
self.doSomethingButton.hidden = YES;
} else {
self.leftSwitch.hidden = YES;
self.rightSwitch.hidden = YES;
self.doSomethingButton.hidden = NO;
}
}
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操作表单
需要遵从UIActionSheetDelegate协议，代码示例：
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| - (IBAction)buttonPressed:(UIButton *)sender {
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Are you sure?" delegate:self cancelButtonTitle:@"No Way!" destructiveButtonTitle:@"Yes, I'm Sure!" otherButtonTitles:nil];
[actionSheet showInView:self.view];
}
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警告视图
需要遵从UIAlertViewDelegate协议，代码示例：
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| - (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex {
if (buttonIndex != [actionSheet cancelButtonIndex]) {
NSString *msg = nil;
if ([self.nameField.text length] > 0) {
msg = [NSString stringWithFormat:@"You can breathe easy, %@, everything went OK.", self.nameField.text];
} else {
msg = @"You can breathe easy, eveything went OK.";
}
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Sonmething was done" message:msg delegate:nil cancelButtonTitle:@"Phew!" otherButtonTitles:nil];
[alert show];
}
}
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